Little preschoolers will like making a mural with an animal theme. You should probably find and cut out animal magazine pictures to start with, and then let the children choose the ones they like for gluing down. Glue sticks are neat to use with small children. They will paste some of the pictures upside down. Expect it and do not scold them. It is the process that is important in this craft idea. The children can also use animal cookie cutters dipped in finger paint to stamp animals on the mural, too. You may need to tape the paper to the table so it doesn't slide around while the children work.
An elaborate form of this craft idea that adults often make is a quilt around a theme. Each person in the group creates a quilt square to represent some aspect of what the group stands for. These quilt squares can be colored with fabric pens or crafted of patchwork or applique. Again, the craft idea is to build group solidarity and not to highlight one artist's skills over another. When the quilt top is completed, it can be a group project to tie it or quilt it. It can be hung in a special central location or given to an appreciated leader or member.